This isn't much of a concern. Since blood levels are up anyway, the fluctuation won't make much difference in terms of results.
What does everyone think the results of going from a ng level of 4000 to 2500 would be? Likely, nothing.
And for the millionth time, enth does not take that long to "kick in". It's less tha 24 hours. Prop is simply a shorter acting ester that has a bit more biuoavailability but people have a problem with that concept. They keep thinking of it as acting immediately wheres long acting esters take weeks to begin working and that simply is not true.